paste -d '||' ./folink/diff.txt ./folink/example.txt

# abc|abc
# bcd|bcd
# cde|cde
# bcd|abc
# dfs|bcd
# csd|dfs
# abb|csd
# abc|abb
# cdd|abc
# bcd|cdd
# bbc1|bcd
# ccc|bbc